A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

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She was using 12 phones in false names at the time police were investigating.

"This was an elaborate and sophisticated scheme," Judge Gavan Meredith said while sentencing the group, also telling Kim there was evidence of her lavish lifestyle at the time.

The court has previously heard Kim lived in a Southbank apartment, visited a beauty parlour up to four times a week and dined out in sessions that could cost about $2000 in one sitting.

Her co-offender sister, Moonja Kim, 58, and Mae Ja Kim's estranged husband, Huan Ye, 34, and associate Zhe Fang, 27, have also been jailed after they pleaded guilty to aiding and abetting dealings with the proceeds of crime.

They helped her run day-to-day operations involving the sex workers, including collecting earnings and organising rosters.

All four will be released on a two-year, $5000 recognisance after they have served about two years in jail.

Mae Ja Kim's minimum jail term was the longest at two-and-a-half years, but she has already served more than 500 days behind bars in pre-sentence custody.

Judge Meredith said the group had shown some degree of remorse and had reasonable prospects of rehabilitation.

Mae Ja Kim pleaded guilty to one count of dealing with the proceeds of crime, in excess of $50,000.